Screen resolution automatically changes!!!!!!

I have LG Flatron E700SH monitor. When i turn on my pc the intel logo appears on screen at that time when i press setting key which is given in front of monitor it reads resolution of 800*600/75 Hz User Mode. Then i keep continue and Windows XP logo appears at that time resolution shows 800*600/85 Hz User Mode. Then user screen appears where we have to enter our password at that time resolution shows 1024*768/ 85Hz Preset Mode and it remains same till i shut down my pc. And when i again turn on my pc the above said resolutions starts similar way. So i am worrying what has gone wrong with my pc. I have tried to reinstall Windows XP and drivers but nothing helped me. My mother board is GA-8I865GVMF-775. Which drivers i have installed they are as below:

That's perfectly normal. As the system starts it uses basic vga & you may get a splash screen at a different resolution. All that's happening is that the monitor is recognising the change in resolution and responding accordingly, Once you're into Windows it's you who gets to decide on the resolutions. If the monitor didn't flash up the resolution it was displaying (which is common on many monitors) you'd be none the wiser.

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